Mineral fillers and pigment containing carbonate

ABSTRACT

Carbonate-containing mineral fillers, pigments or similar materials are described which are characterised in that they have 
 
  a) a rhombohedral or substantially circular particle shape, 
  b) a steepness factor from 1.1 to 1.4, 
  c) a ratio
 R = % of the particles &lt; 1 &lt;0&gt;m DIVIDED % of the particles &lt; 0.2 &lt;0&gt;m = 8 to 19
 and 
  d) a mean statistical particle diameter of 0.4 - 1.5 &lt;0&gt;m. 
 
&lt;??&gt;These materials can be used in the paper industry both as paper filler and as coating pigment. 
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